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Electronics Letters

Issue 19 • Date Sept. 12 2013

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Displaying Results 1 - 25 of 37
  • In brief

    Publication Year: 2013, Page(s): 1192
    IEEE is not the copyright holder of this material | PDF file iconPDF (86 KB)
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  • Interview

    Publication Year: 2013, Page(s): 1192
    IEEE is not the copyright holder of this material | PDF file iconPDF (93 KB)
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  • Data in the wind

    Publication Year: 2013, Page(s): 1193
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (471 KB)

    A team of researchers spread accross the world are working to develope macro-scale molecular communications with a focus on smart monitoring of built environments. View full abstract»

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  • On the double

    Publication Year: 2013, Page(s): 1194
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (262 KB)

    The first antimonide-based quantum cascade laser (QCLs) to reach a wavelength of 19 μm has been demonstrated by a team from Universit?? Montpellier 2/CNRS in France. The InAs/AlSb QCL made with a double metal waveguide demonstrates, not only the highest wavelength so far for this material, but also record threshold current densities and an operating temperature of 170 K. View full abstract»

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  • Antenna design exploiting duplex isolation for 4G application on handsets

    Publication Year: 2013, Page(s):1197 - 1198
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (497 KB)

    A novel design addressing the antenna bandwidth issue for future communication standards on handsets is presented. It consists of a tunable-antenna-pair for operation with a tunable front-end. The antennas are narrow-band and frequency-reconfigurable. This Letter focuses on the low communication bands. Measurements of the design are shown in band 12, and exhibit a receiver-transmitter isolation ab... View full abstract»

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  • Circularly-polarised high gain cavity antenna based on sequentially rotated phase feeding

    Publication Year: 2013, Page(s):1198 - 1200
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (465 KB)

    A Fabry-Pérot cavity (FPC) array antenna providing both very high gain and circularly-polarised (CP) behaviour is proposed. To increase antenna gain and to obtain the CP characteristic, a superstrate is introduced above 2 × 2 feeding microstrip patch antennas (MPAs), which converts linearly-polarised (LP) incident waves to CP waves. Input phase difference between MPAs is designed to... View full abstract»

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  • Non-intrusive estimation of loss resistance of planar antenna over human body

    Publication Year: 2013, Page(s):1200 - 1201
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (249 KB)

    A new method is presented to estimate the loss resistance of antennas located slightly above a lossy medium. This technique is more specifically developed for the context of body area networks. This method is based on the estimation of the antenna resistance above the medium and above a perfect electric conductor. View full abstract»

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  • Robust adaptive beamforming using beamspace steering vector estimation

    Publication Year: 2013, Page(s):1201 - 1203
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (163 KB)

    To solve the problem of performance degradation owing to imprecise knowledge of the array steering vector and inaccurate estimation of the sample covariance matrix, a novel algorithm based on beam-space steering vector estimation for robust adaptive beamforming is presented. By using the complementary set of the spatial sector in which the actual steering vector lies, a beam-space transformation m... View full abstract»

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  • Small-area low-ripple chopper instrumentation amplifier using sample-and-hold circuit

    Publication Year: 2013, Page(s):1203 - 1205
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (213 KB)

    A small-area low-ripple chopper instrumentation amplifier (IA) using a sample-and-hold circuit is proposed. The proposed chopper IA employs a ripple-reduction loop (RRL) to suppress chopper ripple which is generated by the up-modulated offset and 1/f noise. The conventional RRL is not area-efficient since a sensing capacitor occupies a large chip area. Thus, the RRL using the sample-and-hold circu... View full abstract»

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  • Broadband wavelength swept source combining a quantum dot and a quantum well SOA in the wavelength range of 1153-1366 nm

    Publication Year: 2013, Page(s):1205 - 1206
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (486 KB)

    A wide tuning range wavelength swept laser for high axial resolution optical coherence tomography reported. Here, a parallel configuration of a quantum dot semiconductor optical amplifier (SOA) and a quantum well SOA is utilised for broadband optical source. The total scanning range of over 210 nm (192 nm at 10 dB) from 1153 to 1366 nm is reported. To investigate the feasiblity of the swept light ... View full abstract»

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  • Fast iterative contourlet thresholding for compressed sensing MRI

    Publication Year: 2013, Page(s):1206 - 1208
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (290 KB)

    Proposed is the use of the contourlet as a sparse transform which is combined with the fast iterative shrinkage/threshold algorithm (FISTA) for compressed sensing magnetic resonance imaging reconstruction. The proposed method not only inherits the simplicity and effectiveness of the original FISTA but also has the sparse curve representation ability of the contourlet. Simulation results validate t... View full abstract»

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  • Softgait: compliant walking assistance via pneumatically actuated robot legs

    Publication Year: 2013, Page(s):1208 - 1209
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    To assist the mobility handicapped, it is necessary to support their body weight in part using an assistive device. Since the human leg can be modelled by a spring during the gait, the assistive device (or robot) should have a certain level of compliance in order to achieve natural gait assistance. A pneumatic cylinder is added in parallel to a leg (which is also a spring) for antigravity with com... View full abstract»

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  • Ultrasonic imaging contrast enhancement using modified dehaze image model

    Publication Year: 2013, Page(s):1209 - 1211
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    In practical ultrasonic images, post-processing that involves incoherent frame averaging such as persistence, spatial compounding and frequency compounding creates a layer of smoothed out electronic noise that is analogous to fog in photographic images. A novel approach to enhance ultrasound image contrast based on a modified dark channel model used to dehaze photographs is presented. Local minimu... View full abstract»

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  • 2.1 GHz MOS mixer linearisation approach for IIP2 enhancement using multiple factor compensation

    Publication Year: 2013, Page(s):1211 - 1213
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (305 KB)

    An integrated downconversion CMOS mixer incorporating a comprehensive compensation scheme is presented which aims to minimise second-order intermodulation distortion (IMD2). Unlike previously reported IMD2 calibration schemes which tune only one nonlinear factor at a time, the presented solution allows simultaneous adjustment of several different factors thus achieving a better compensation. The m... View full abstract»

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  • Paired T-element design for multiple-state acknowledge dependency

    Publication Year: 2013, Page(s):1213 - 1214
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (205 KB)

    A paired T-element that assists in successfully controlling a dual-rail delay-insensitive asynchronous circuit system that implements multiple states containing acknowledge networks, that are interdependent, is presented. A T-element allows triggering of next-state actions concurrently with negation of its acknowledge input. However, this introduces a timing assumption that can cause system failur... View full abstract»

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  • Impact of dynamic variability on the operation of CMOS inverter

    Publication Year: 2013, Page(s):1214 - 1216
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    The impact of dynamic variability due to low-frequency fluctuations on the operation of CMOS inverters, which constitute the basic component of SRAM cell, is investigated. The experimental methodology to characterise the effect of dynamic variability in a CMOS inverter is first established based on fast I-V measurements of the load current following the application of a ramp input voltage ... View full abstract»

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  • NanoFS: a hardware-oriented file system

    Publication Year: 2013, Page(s):1216 - 1218
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (242 KB)

    NanoFS is a novel file system for embedded systems and storage-class memories (like flash) and is specially designed to be directly implemented in hardware. NanoFS is based on an original internal layout intended to achieve an optimal hardware implementation of the file system's file lookup and data fetch operations. File system specification on a sample reader module completely implemented in a p... View full abstract»

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  • New de-embedding method to measure the RF input impedance of grid-powered devices

    Publication Year: 2013, Page(s):1218 - 1219
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (365 KB)

    The power grid is a particular case for electromagnetic compatibility and interferences risk management because it presents a significant coupling area. The profusion of an electronic equipment connected to the network requires a control of the couplings to prevent any incident induced by a weak immunity of electronic devices to natural electromagnetic interferences in the environment or induced b... View full abstract»

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  • Embedding holistic appearance information in part-based adaptive appearance model for robust visual tracking

    Publication Year: 2013, Page(s):1219 - 1221
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (230 KB)

    Part-based adaptive appearance model has been extensively used in increasingly popular discriminative trackers. The main problem of these methods is the stability plasticity dilemma. Embedding holistic appearance information in the part-based appearance model which is learned online to alleviate this problem is proposed. Specifically, the object is represented by sparse multi-scale Haar-like featu... View full abstract»

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  • Hue-preserving gamut mapping with high saturation

    Publication Year: 2013, Page(s):1221 - 1222
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (381 KB)

    Preserving hue is an important issue for colour image enhancement. Here, a hue-preserving gamut mapping method with high saturation is proposed. Experimental results with the Macbeth colour chart and natural images show vivid colour with higher subjective image quality. View full abstract»

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  • Inductive sparse subspace clustering

    Publication Year: 2013, Page(s):1222 - 1224
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (157 KB)

    Sparse subspace clustering (SSC) has achieved state-of-the-art clustering quality by performing spectral clustering over an ℓ1-norm based similarity graph. However, SSC is a transductive method, i.e. it cannot handle out-of-sample data that is not used to construct the graph. For each new datum, SSC requires solving n optimisation problems in O(n) variables, ... View full abstract»

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  • Low-complexity transcoding from H.264 to HEVC based on motion vector clustering

    Publication Year: 2013, Page(s):1224 - 1226
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    The forthcoming high efficiency video coding (HEVC) standard substantially improves the coding efficiency compared with the H.264 standard. It also brings in much higher computational complexity. Transcoding from H.264 to HEVC is an important step to enable gradual migration to HEVC. A low-complexity H.264 to HEVC transcoding algorithm based on motion vector clustering is proposed. Experimental re... View full abstract»

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  • Low-complexity time-domain linear equaliser for single-carrier block transmissions

    Publication Year: 2013, Page(s):1226 - 1227
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (233 KB)

    Traditionally, frequency-domain equalisers have been used to equalise the single-carrier block transmission (SCBT) signals. However, to support the frequency-domain equaliser, two fast Fourier transform modules are required, which will increase the circuit complexity and chip area. A low-complexity time-domain linear equaliser for SCBT is proposed, which is less complicated than conventional frequ... View full abstract»

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  • New compact Ka-band CPW rat-race coupler using GaAs MMIC technology

    Publication Year: 2013, Page(s):1227 - 1229
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (398 KB)

    A new compact Ka-band rat-race coupler (RRC) is proposed and fabricated in the 0.15-μm GaAs pHEMTs process. Since the developed RRC is implemented by asymmetrical coplanar-waveguide T-structures, it has a compact circuit footprint and a return-loss bandwidth similar to that of the conventional coupler. Besides, a short-circuited quarter-wave stub is attached into the ring of the RRC to flat... View full abstract»

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  • SiGe 135-GHz amplifier with inductive positive feedback operating near fmax

    Publication Year: 2013, Page(s):1229 - 1230
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    A common base five-stage D-band amplifier developed in a 0.18-μm SiGe HBT technology is presented. An inductive positive feedback technique is employed to enhance the gain, leading to 12.2 dB peak gain at 135 GHz with a power consumption of 67.2 mW. Measured output saturated power was - 5.8 dBm. The total chip area including pads is 1.54 × 0.56 mm2. View full abstract»

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Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK